Analysis

Calculate the Explosives Usage of a Planned Blast

The Analysis option to calculate the amount of explosives required to blast an area. This option is most useful when different parts of the blast are charged using different combinations of explosive types.

Note

A blast explosive parameters section and a blast percentages section must have been defined in the blastdes.spc file before you can use this option. See the Overview for more details.

Instructions

• Select Open Pit menu
• Select Explosive Analysis submenu
• Select Analysis option

The following panel displays.

Blast Explosive Data panel

This panel (table) is used to calculate the totals of each type of explosive.

Tonnes for shot

This is a compulsory numeric field for the tonnes in the area (blast boundary) to be blasted. The default is the tonnage value calculated by the Tonnage option. This number is used in calculating the Powder Factor and other blast statistics.

#HOLES

Enter the number of holes to be blasted.

EXPLOSIVES

The headings above columns 2-7 show the types of explosives used on the site, for example, ANFO , POWERGEL , GELIGNITE etc. They are derived from the list of explosive types in the blastdes.spc file.

The fields under the headings are used to enter the metres of explosives per hole. The blast pattern may be made up of several sections which are charged differently, For example, one section may be 25 holes, charged entirely with ANFO.

If the hole length is 15m, then the table entry would look like:

#HOLES       EXPLOSIVES ANFO     001    101 25       15       0      0

If 13 holes are charged (half ANFO and half 101 explosives), then the entry would be:

#HOLES       EXPLOSIVES ANFO     001    101 13       7.5      0      7.5

Select OK.

A dialog box displays allowing you to select the required hole diameter. The diameters are defined in the blast explosive parameters section of the .spc file.

Once the hole diameter is selected, a dialog box containing the sets of available explosive percentages displays. The explosive percentages are defined in the blast percentages section of the .spc file.

Once an explosive percentage is selected, the quantity of each explosive type required for the pattern is calculated and displayed in the Report Window of Vulcan.

Diagram 1 - Explosive Data Summary